From fa3c3e8a2977841ca7263b5dff3db96e995536d2 Mon Sep 17 00:00:00 2001
From: Cuong Manh Le <cuong@windscribe.com>
Date: Wed, 21 Dec 2022 00:10:14 +0700
Subject: [PATCH] Close http3 roundtripper when error occurred

For http3, if the network were down, the quic transport needs to be
closed, so the transport can create new connection when network up.
---
 doh.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doh.go b/doh.go
index 511e28c..546f8c7 100644
--- a/doh.go
+++ b/doh.go
@@ -48,6 +48,9 @@ func (r *dohResolver) Resolve(ctx context.Context, msg *dns.Msg) (*dns.Msg, erro
 	}
 	resp, err := c.Do(req)
 	if err != nil {
+		if r.isDoH3 {
+			r.http3RoundTripper.Close()
+		}
 		return nil, fmt.Errorf("could not perform request: %w", err)
 	}
 	defer resp.Body.Close()